WEICON WEICONLOCK AN 302-72 Anaerobic Thread Sealant

WEICON WEICONLOCK AN 302-72 Anaerobic Thread Sealant is an anaerobic industrial adhesive solution designed to prevent loosening in threaded connections while also providing sealing. Its red color makes the applied bead easier to see during assembly, and its high viscosity helps form a controlled film on the threads. Because it cures to a high-strength class, it is preferred for connections where permanent locking is desired and disassembly is difficult. With suitability information for systems in contact with drinking water, it can present a profile that may be a selection criterion for plumbing and process lines.

Technical structure and operating principle of WEICONLOCK 302-72

AN 302-72 works as an anaerobic, resin-based industrial adhesive that cures in narrow gaps between metal surfaces when contact with air is cut off. By filling the thread gaps, it limits micro-movements, reduces the risk of loosening under vibration, and helps block capillary leak paths. With a high viscosity range of 6,000–15,000 mPa·s, the product can remain in place without running and aims for a more stable distribution on the threads. It is specified for use on threaded connections up to M56 (R 2”) and has a stated maximum gap-bridging capability of 0.3 mm. The manufacturer is WEICON GmbH & Co. KG and the origin is Germany.

Performance properties, strength, and temperature resistance

The product is positioned as “difficult to remove” due to its high-strength locking character, so disassembly planning in maintenance should be adjusted accordingly. Breakaway torque is given as 20–30 Nm and prevailing torque as 40–75 Nm, supporting the locking effect in threaded joints. Shear strength is reported as 10–15 N/mm² according to DIN 54452; this serves as a reference for applications targeting permanent joints. Temperature resistance is stated as -60 °C to +230 °C, providing flexibility for use in lines exposed to high-temperature cycles. Since initial handling strength is given as 20–40 minutes and full strength development as 5–10 hours, load timing should be planned accordingly.

Application method, surface preparation, and standards compliance

For best results, degreasing and cleaning the surfaces are recommended; the cleaner the surface, the more stable the result. The product should be applied evenly directly from the bottle using the dispensing tip, and the tip should not be allowed to contact metal; not returning product that has contacted metal back into the bottle is critical to prevent premature curing inside the container. For sealing purposes, it is applied to the thread in circular movements, the parts are assembled, and then tightened. In suitable process conditions, using an activator can be considered as an accessory, especially to support process control in difficult curing conditions. On the approvals/suitability side, it includes DVGW and drinking-water application suitability information, along with a reference to UBA KTW-BWGL.

Industry applications and key advantages

This industrial adhesive is developed for points requiring locking and sealing in threaded connections and stud-bolt applications. In the process industry, it helps reduce vibration-related loosening in threaded auxiliary connections of pumps, compressors, gearboxes, and flanged equipment. In plumbing and infrastructure applications, it can be considered for connections—especially those linked to drinking water—where suitability expectations apply. High viscosity increases application control and helps manage leak risk by aiming for a more uniform distribution on the threads. It is stated that it can remain stable for at least 24 months at room temperature in its unopened original packaging and should be protected from heat sources and direct sunlight.